Supply of air and liquid fuel to internal-combustion engines



Sept. 21 1926. Y 1,600,473

A HUTSON SUPPLY OF AIR AND LIQUID FUEL TO INTERNAL COMBUSTION ENGINES Filed 9, 1922 2 Sheets-Shept 1 Sept. 21 1&26. 1,600,473 A-HUTSQN SUPPLY OFAIR AND LIQUID FUEL T0 INTERNAL CGMBUSTION ENGINES,

' F ed Auust "Luz 1. 1

a w A mun mmm WIMI.

Patented Sept. 21, 1926.

UNITED STATES ALEXANDER HUTSON, or LIVERPOOL, nneLnn Y SUPPLY OF AIR AND LIQUID FUEL TO INTERNAL-COMBUSTION Application filed August 9, 1322, Serial No. 580,731, and in Great Britain August 11, 1921.

This invention relates'to the supply of liquid fuel and air to an internal combustiori engine, and has for its object to provide new or improved means for ensuring that the desired proportion-s of fuel and air shall be admitted to the engine at all speeds thereof and at all openings of the throttle valve.

Apparatus for the supply of liquid fuel and air to an internal combustion engine, according'to my invention, essentially comprises means whereby the quantity of fuel delivered by a fuel pump is regulated through the movement of an accelerator pedal, or other device, which simultaneously controls the tension of .a spring which tends to close an air valve, so that the pressure of the mixture in the induction pipe of the engine and the rate of fuel supply will he in a desired ratio or relationship.

Subsidiary features are hereinafter described and pointed out'in the claiming clauses appended hereto.

In the accompanying explanatory drawings there is illustrated (Figs. 1 to appara-tus whereby my invention may be carried into effect.

ifm

Fig. 1 being an elevation, V

Fig. 2 a vertical section, taken as on line XX Fig. 1, and

Fig. 3 a transverse section taken as on line YY Fig. 1.

Figs. 4, 5, and-6 are, respectively, elevation, plan, and end view, of means for varying the fuel delivery of a reciprocating pump.

Referring first to Figs. 1 to 3: v

1 indicates an air induction chamber which is connected to the induction pipe of an in-' ternal combustion engine by means of the flange 1 and 2 is a diaphragm formed of flexible leather or other suitable material and disposed between the metal discs 3 and 3, the outer circumferential margin of said diaphragm being clamped between the air induction chamber 1 and cover 1.

Integral with said diaphragm-securing disc 3 is-a rod 4 whereto is anchored one end of a helicallv coiled wire spring 5, the other end whereof is secured to a rod 6 which is connected with a pedal 6 or other suitable manual control of the engine. Said cover 1 of the chamber 1 is provided with a neck piece 1 which acts as a guide for the rod 4 and whereon is disposed an end or a tubular member 7 which houses said spring, andthe outer end of which acts as a guide for said 8 denotes a rod, one .endwhereof is articulated at 9 with the diaphragm disc .3, whilst the other end is articulated with a butterfly valve 10 disposed in the air inlet end of the induction chamber 1 in such manner that the motion of said diaphragm '2 and discs 3, 3 allows said valve 10 to open or close and therefore control the-admission of air to said induction chamber 1.

Disposed on the top of said chamber 1 is a lab plate closure 11 which normally maintained in its closed position by means of a light spring 12 disposed round a spindle 13 the lower end whereofis secured to' the lch amber in which are formed ports 14 below the plate closure 11'. The object of the provision of said valve 11 is to relieve the pressure and prevent damage in'case of a premature explosion in the induction pipe.

Said spring 5, being in tension, tends to pull said valve 10 to al shut position, and an opposing light helical tension spring 15 is provided .on' the .valve spindle 16. One end of the spring 1:5 is anchored to the spindle:

able position on either side of valve 10, but

if entered on the engine side of same it is desirable that the provision be made-as by an opening from the fuel supply pipe to the atmosphereto relieve the pump discharge from the suction produced by the engine; the jet may also have some suitable arrangement, such as a needle and spring, to reduce its area when the vacuum in the induction pipe is increased and the supply of fuel is correspondingly reduced.

20 is a friction disc which is mounted on the shaft or spindle 21 driven by the engine through suitable connections, and 22 is a disc which is disposed on asleeve 28 slidably mounted on a. rod 2i which drives pump 17, said rod 24 being operatively connected with the sleeve 23 by means of a lateral pin, or

like projection 25 provided thereon and extendin into a longitudinal slot 26 of said sleeve 23. Said disc wheels 20, 22 are enclosed by means of a casing 27 whereto is secured a bracket 28 carrying spindle 21, and around said spindle 21 is disposed a helically coiled wire spring 29 which maintains I spring maintains said throttle valve closed, and the driven disc 22 of the friction gearing is near the centre of the driving disc 20; then when {the engine is started, the manual control (whereto both rod and lever 32 are connected) is actuated by the operator with the result that the driven disc 22 of the gearing is moved towards the periphery of the driving disc 20 to increase the speed of the pump 17, and simultaneously the movement of the manual control releases or reduces the pull or tension on said spring 5 in order to permit the vacuum created in the induction pipe to open (or allow to be opened) the throttle valve 10 and admit air at the pressure to maintain the required mixture of air and fuel.

35 is a lever to one arm whereof is attached a centre pin adapted to bear on the centre of the driving disc 20; to the other arm may be attached a Bow-den wire by I means of which the discs may be moved out of'contac't if and when desired, for instance,

when the engine is at rest.

Referring now to Figs. 4, 5, and 6 of the drawings, 36 denotes a lever wherein is form'a slot 37, and 38 isa bridge member secured to one end of said lever and carrying a fulcrum pin 39 on which ,is revolubly mounted a rod 40, said rod being maintained in position by means of a guide 41. 4-2 is a. block slidably disposedin said slot 37 of lever 36, whereto is secured the pump rod 43. tevindicates a link for actuating said slotted lever 36.

In operation, motion is conveyed from the engine to lever 36 by means of link 44;; the

fuel pump rod 43 is driven by the sliding block l2, and the stroke of the pump, and so the quantity of fuel delivered by it, varies according to the position of the block 42 in relation to the fulcrum pin 39. Rod 40 carrying fulcrum pin 39 of said slotted lever is actuated by the accelerator pedal or ther control simultaneously with the varying of the tension on spring 5. t

VJhat I claim as my invention and desire to secure by Letters Patent is 1. An apparatus forthe supply of liquid fuel and air to th-einduction pipe of an internal combustion engine, comprising an engine driven fuel pump, a manual control device for said pump, an air valve, a main spring holding said valve normally closed, a spring of lesser tension adapted to open said valve when said main spring relaxes, and means adapted to be operated in synchronism with said pump control device to relax said main spring so that said air valve may open and the pressure of the mixture of air and fuelin the engine induction pipe and the rate of fuel supply will be in a desired ratio. 7

2. In an apparatus for the supply of liquid fuel and air to the induction pipe. of an internal combustion engine, as specified in the preceding claim, a diaphragm under the influence of the pressure in the induction pipe of the engine, said diaphragm being connected to said main spring.

In testimony whereof I affix my signature.

ALEXANDER nUrsoN. 

